# Tag Info

5

According to Scott and Jones1: ... problems arise with branched alkyl chains, a side chain methyl group or a gem-dimethyl-branched chain cannot undergo β-oxidation by microorganisms and must be degraded by loss of one carbon atom at a time (α-oxidation). * text by the authors, highlighting and hyperlinking by me. A study by Whyte et al2 on the degradation ...

3

Bu/iBu or Bu/iBu/Pr mixtures are easier/cheaper to get instead of pure components as Ivan says, as there is extra effort for their separation, not the extra effort for their mixing. Butane(Bu)/isobutane(iBu)/propane(Pr) boiling points are $\pu{0 ^\circ C}$, $\pu{-11 ^\circ C}$ , $\pu{-33 ^\circ C}$ respectively. Real boiling points would be higher than ...

3

Always consult the Material Safety Data Sheet of any substance if you are unsure about handling. In the case of isopropyl alcohol and the 70% aqueous solution, unless you can still smell it on the clothing or other fabric it should be fine. It is not dangerous on contact with skin although it tends to dry out your skin with frequent use (e.g. in hand ...

2

MOT Type 1 sub base appears to be made from limestone (which, chemically speaking, is mostly calcium carbonate). Assuming limestone and vinegar are the only materials present, the relevant reaction is that of calcium carbonate with an acid (vinegar): $\ce{CaCO3 + 2H+ -> Ca^{2+} + H2O + CO2}$ i.e. Assuming that nothing else is present, the gas is carbon ...

2

According to Wikipedia, solubility of aspirin in water is $\pu{3 g/L}$ or $\pu{3 mg/mL}$ at $\pu{25 ^\circ C}$. Thus, it is not hard to make a $0.3\% (w/v)$ aquious aspirin solution (maximum concentration, which equals to $\pu{300 mg}/\pu{100 mL}$ at $\pu{25 ^\circ C}$). Therefore, your target, $\pu{10 mg}/\pu{100 mL}$ at $\pu{25 ^\circ C}$ can be easily ...

1

Sigma-Aldrich has listed long list of their Basic Ingredients of Microbiology, which are called Protein Sources (Peptones): Peptones and extracts are excellent natural sources of amino acids, peptides, and proteins in growth media. They are most often obtained by enzymatic digestion or acid hydrolysis of natural products such as animal tissues, milk, and ...

1

TL;DR Yes, the reaction is feasible at $\pu{60 ^\circ C}$. Just extending my comment into an answer. Goethite and ferrihydrite(not ferrihydrate) are two different things. They are polymorphs of iron oxyhydroxide ($\ce{FeOOH}$). Goethite is $\ce{α-FeO(OH)}$ while ferrihydrite is amorphous/nanocrystalline hydrated iron oxide, officially formulated as \$\ce{...

1

Any time a piece of equipment goes down, you cannot get a repair person, and you are not sure what to do, try to call or email the manufacturer. This is the US contact information for Sakura. They know their product better than anyone on this site and will probably know about common issues. Steam will loosen, but will not get hot enough on a stove to remove ...

1

There is a way to achieve a result strictly within the bounds of your question, but it's just as insane as these bounds. Boil a solvent, not dishwashing liquid. Say, gasoline. Or much better dichloromethane (sold as paint remover), if there is not much plastic at the kitchen. Don't turn fans on. Hood must act like reflux condenser. Let dichloromethane fumes ...

1

The source of the "hard yellowish coating" may be Silver carbonate (Ag2CO3), as per Wikipedia: Silver carbonate is yellow but typical samples are grayish due to the presence of elemental silver. I suspect the teapot in question is "electroplated Britannia metal" per Wikipedia with a nickel alloy as the base metal, as to quote: After ...

1

In a car radiator below the freezing temperature of water, the water part increasingly turns to slush. The glycol just prevents the mix from freezing hard enough to expand and crack engine blocks, etc. But, ice is lighter than straight water and I haven't seen that mentioned or addressed here. Ice/slush rises in the system and then might be subsequently ...

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